Q
Silica sol__________________?
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A
A. Is applied to the walls of the investment to produce hygroscopic expansion
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B
B. Increase the strength and the setting expansion of the phosphate-bonded investment
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C
C. Acts as a retarder in the silica bonded investments
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D
D. Acts as a refractory in the silica bonded investments
Correct Answer:
B. B. Increase the strength and the setting expansion of the phosphate-bonded investment
